Photographic roll-film



Feb. 19, 1935.

A. BARENYI' PHOTOGRAPHIC ROLL FILM Filed Oct. 21, 1933 INVENTOR M /W yflzzorney Patented Feb. 19, 1935 I UNITED STATES PATENT OFFICE assignorto Voigtlander & Sohn Aktiengesellschaft, Brunswick, Germany, ajoint-stock company of Germany Application October 21, 1933, Serial No.694,626 In Germany October 31, 1932 1 Claim. (Cl. 95-9) My inventionrelates to improvements in photographic roll-films, and moreparticularly in rollfi1ms in which a strip of gummed paper or the likeis attached to the end of the protective backing strip of the sensitizedfilm which is located at the inner end of the film wound on the filmdelivering spool, the said gummed strip being used for fixing theexposed film in position on the film receiving spool. After the exposedfilm has been wound on the film receiving spool, and-before the gummedstrip is applied to the outer convolution of the backing strip of thefilm for holding the same in position, a part of the end of the backingstrip is folded inwardly or torn off so as to expose the coated surfaceof the strip of paper, and in this operation it happens that the end ofthe backing strip slips from the hand of the photographer so that thespool is partly unwound and light has access to the sensitized film.

The object of the improvements is to provide a roll-film in which theend of the backing strip having the gummed strip of paper attachedther'eto may be readily torn off, so that there is no danger of thestrip slipping from the hand of the photographer, and with this objectin view my invention consists in providing the end of the backing stripwith a weakened line disposed transversely of the gummed strip of paperand permitting the end of the backing strip to be readily torn off orfolded inwardly so as to expose the gummed strip of paper.

For the purpose of explaining the invention an example embodying thesame has been shown in the accompanying drawing in which the samereference characters have been used in all the viewsxto indicatecorresponding parts. In said drawing Fig. 1 shows the tail or inner endof the backing strip and a strip of gummed paper attached thereto, and

Fig. 2 is a sectional elevation showing the film receiving spool havingthe film and most of the backing strip wound thereon, the outer end ofthe backing strip being torn off to expose the gummed strip.

To the tail end of the sensitized film 6 a protective backing strip 1 isattached in the usual per or other suitable material is'attached at 3,

the said strip being coated at its inner side with a suitable adhesive,and lying loose with its outer portion on the backing strip. The end ofthe backing strip is provided with a weakened, perforated or scored line5 disposed transversely of and crossing the strip 4 and permitting theend of the backing strip to be readily torn off for exposing the gummedsurface of the strip 4.

In Fig. 2 I have shown the film receiving spool 7 having the exposedfilm and most of the backing strip I wound thereon and also having theend of the outer end of the backing strip torn ofi along the weakenedline 5, so that the end of the gummed strip of paper 4 is exposed andmay be readily fixed to the outer convolution of the backing strip.

I have found that by providing the weakened line 5 the end of thebackingstrip 2 may be readily torn 0115 without the photographer losing hold ofthe spool.

I claim:

A roll-film comprising a sensitive strip, a strip of protective backingmaterial of greater length than said sensitive strip, to which saidsensitive strip is attached, the tail end of said backing strip, beyondthe end of said sensitive strip, being tapered to form a spool-engagingtongue, the said backing strip being weakened on a transverse linespaced at an interval forward of the tip of such tapered tongue, and agummed securing strip'attached at one end'to said backing strip at apoint forward of such weakened line and extending free and unsecuredrearwardly from such point of attachment beyond the weakened line andterminating short of the tail end of the backing strip, whereby when thebacking strip with the sensitive strip carried by it has been coiledupon a film-receiving spool and the end of the tapered tongue has beentorn away along such weakened line the gummed strip may serve to securethe coil.

ARPAD BARlilNYI.

